Magnetic clutch.



No. 821,021. PATENTBD MAY 22, 1906. Gr.11. DAMON.

MAGNETIC CLUTCH.

APPLIoAfTloN EILBD M1145, 1903.

2 SHEETS-SHEET z.

O Q O O x Q i it 2 h@ w 0 I v I* *u l., s Uilm-TTM:

9- In `III Q A HIIIIIIIIIIIIHIIIIIHII UHHIIIHII Ild .l UNITED STATES i PORATION OF WISCONSIN.

:PATENT .oiuErcE-- GEORGE A. DAMON, OFy CHICAGO, ILLINOIS, ASSIGNO-,R TO THE ARNOLD MAGNETIC CLUTCH COMPANY, OF MILWAUKEE, WISCONSIN, A COR- MAeNETlo oLuTcH.

. Patented May 22, 1906.

To all wiz/nm it may concern:

Be it known that I, GEORGE A. DAMON, a citizen of the-United States, residing vat Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Magnetic Clutches, (Case B,). of which the following' is a full, clear, concise, and exact description, reference be'- ing had' to the accompanying drawings,

forming a part of this specification. v

My invention relates to improvements in magnetic clutches.' Y,

In devices of this character there is al ways a tendency of the members to remain clutched after the exciting-coil' has been ydenergized owing to residual magnetismv'Various mechanical means have been devised to free the members simultaneously with the opening of the magnetizing-circuit; but no efforts have been made to overcome the residual magnetism other than to construct the parts of metal which will retain the least amount of magnetism..

The object vof my invention is to destroy the residual magnetism within the members immediately upon energizing the coil which creates the same in order that the members may quickly separate. This is accomplished in the preferred form of myI invention by roviding tw exciting-coils which will pro uce magnetic iields in proximity to each other having lines of force moving in opposite directions.- When one coil is excited the other is denergized, and

the magnetic eld of the excited coil will de-4 stroy the residual magnetism in the iield of the other coil by reason of' the lines of force of said fields moving inopposite .directions and the magneticfield of the energized coil being stronger than theresidual magnetism ofthe other ii'eld.

. In thev accom anying drawings the several views are as follows.

Figure 1 is asectional elevation of my improved clutch. Fig. 2 is an end -view thereof, and Fig. 3 is a view of my improved clutch in connection with a planer-bed.

Inl the drawings is illustrated one way of embod 'ng my invention in a'practical device. herein is shown a shaft 1, on which is keyed ay magnet member 2. The oppov site faces of saidfmagnet member are'each provided with an annular channel .3, in

which is arranged windings 4, The currents in said windings 4 are caused to move in reverse directions, whereby the magnetic fields produced have lines of force which move in` opposite directions, and the coils are so arranged that the'iields produced by each have portions of their circuits in common. Each winding ispreferably provided with a covering 5, placed in said channels. Upon the periphery of said magnet 'member are arranged, preferably, three collectingrings 6, which are suitably insulated from said member and each other. As will be seen by reference to Fig. 3, the outer rings are each connected with one side of a different coil and the other sides of said coils are connected with the center collecting-ring.

One armature or member 7 is arranged opposite each side of the magnet member and preferably has a lead or zinc face 8,

which meets with the magnet memben shaft andare free to move independent of each other and the ma net member.

. In Fig. 3 the clutc herein described is shown set for use in connection with a planerbed. f The shaft on which the members of the clutchare mounted is journaled in bearings 10 and has one end geared to a rack cna planer-bed 12. On a driving-shaft 13 are fixed gear-wheels 14', one of which meshes directly with one of the gear-wheels 9, and the 4other meshes with an idler 15, whichmeshes with the other gear-wheel 9. By this arrangement the armatures will be rotated in opposite directions, and the magnet member maybe clutched to either one of them, according to the direction in which it is desired to move the planer-bed. The switch 16 for alternately closing the 'circuit throughteither of the windings may be connected with the planer-bed and operated thereby. In this manner the planer-bed may be shifted automatically by alternately connecting the magnet member with the oppositely-moving armatures. l Y. The current is caused to How through the windings, in opposite direction, wherebyhe lines of force in the magnetic iields excited thereby move in opposite directions, as indicated by the arrows in Fig. 3. Only one coil IOO is energized at a time, 'and the magnetism of the field excited by the energized coil being stronger than the residual magnetism of the vother field it destroys the residual magnetism.A The residual magnetism being desti-eyed in the field of tlieinagnet to which the armature is attached, said armature will be free to part from the magnet member, and the tendency which the members would otherwise have to remain clutched will no longer exist. innumerable devices may be employed to open the circuit ol' one coil and close that ,of the other almost instantly, and thereby destroy the residual magnetism practically simultaneously with the denergization of the exciting-coil of its field. In this way the magnet member may quickly have its movement reversed, for as soon asitis released from the armature with which it has been moving it may be clutched to the oppositely-inoving armature.

It is immaterial of course which is the driving and which is the driven member, as they may be arranged to suit the circumstances.

Various changes may be made in the details of construction, arrangement, and combination of parts as herein shown and -described Without in any way departing from the spirit of my'invention and the saine yet remain intact and be protected.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a device ofthe character described, a magnet member having exciting-coils adapted to produce magnetic fields with the lines of force of one fieldmoving in an opposite direction to those ofthe other, whereby when one coil is energized its field will destroy the residual magnetism in the other field, substantially as described.

2. In a device of the character described, a magnet member having energizingcoils adapted to produce magnetic fields which have lines of force moving in` opposite directions, the circuits of said fields having portions which are iii common whereby when one coil is energized its field will destroy the residualmagnetism of theother field, substantially 'as described. l y

3. In a device of the character described, a magnet member Y having energizingcoils adapted to produce magnetic fields which have lines of force moving in opposite directions, the circuits of saidfields having portions which are in common, said coils adapted to be excited one at a time whereby the field excited 'by the energized coil will destioy the Aresidual magnetism of the other field, substantially as described.

4. In a device of thechai'acter described, a

magnet member having exciting coils adapted to produce magnetic fields which have lines o force moving in opposite directions, the lcircuits of said fields having portions which are in common, and means for alteriiately energizing said coils whereby the field excited by the energized coil will destroy the residual magnetism of the otherv field, substantially as described. y

5. A machine of the character described, comprising a magnet member having excitiiig-coils, which will produce magnetic fields which have portions .of their circuits in common, and means for causing the currents in said coils to move in opposite directions in order to excite magnetic field having lines of force which move in different directions, whereby when one coil is energized its field will destroy the residual magnetism of the other field, substantially as described.

6. In a device of the character described,

the combination of an armature and a magnet member which 4are independently movable, said magnet member having excitinglcoils adapted to produce magnetic 'fields which have their lines of force moving in opposite directions, the circuits of said fields having portions in common whereby when the exciting-coil of the magnet which attracts the armature is denergized and the other coil energized, the magnetic field of the latter will destroy the residual magnetism in the field of the former and thus release the armature, substantially as described.

7. In a device of the character described,

the combination with a pair of armatures,

which are movable independently of each other, a magnet member arranged between said armatures, energizing-coils associated with said magnej'J member and each adapted IOO to produce a magnetic field which will attract y one of said armatures, said fields having lines of force moving in opposite directions and circuits with ortions in common, whereby when one ofp said coils is energized its field will destroy the residual magnetism .of the other field, substantially as described.

8. In a devicecf the character described, the combination with a pair of armatures,

IIO

which are movable independently of each other, a magnet member arranged between said armatures, energizing-coils associated with said magnet member and each adapted to produce a magnetic field which will attract one of said armatures, said fields having lines of force moving in opposite directions and circuits with ortions in common, and means `for alternatey closing'the circuitsof said coils whereby the field of the energized coil will destroy the residual magnetism of the other field, substantially as described. p 9. A magnetic clutch comprising a pair of exciting-coils, one of said coils being arranged to destroy the residual magnetism of the other coil, said coils being adapted to be excited one at a time, substantially'as described. 1 0. A magnetic clutch havin a pair of excitmg-coils connected in paralle and one part in common, said coils being adapted to pro- @met sa duce magnetic fields with the lines of force of one field moving in an op osite direction to those-ot` the other, said colli; being adapted to be excited one at a time, whereby when one coil is energized its field will destroy the resi,- dual magnetism of the other eld, substantiaily as described.

11. In a magnetic clutch, a magnet member having two magnetic circuits, armatures on either side of the magnet. member, means for energizin either of the magnetic circuits and for there y destroying the magnetism in the other magnetic circuit.

12. In a magnetic clutch, a magnet member having two magnetic circuits, armatures on either side ofthe ma net member, means for energizing either of t e magnetic circuits and thereby attractin one of the armatures and at the same time estroying the ma etism in the other magnetic clrcuit and re easing the other armature.

13. In a magnetic clutch, a magnet member having two magnetic circuits, armatures on -either side of the magnet member, means for energizing either ofthe magnetic circuits v and thereby attracting one of the armatures and at the same time destroying the magnetism in the other magnetic circuit and releas ing the other armature, Vand a driving-shaft geared directly to one of said armatures and reversely to the other armature.

14. In a magnetic clutch, a driven shaft, a magnet member attached thereto, said magnet member having two magnetic circuits, armatures Ioosely mounted on the driven shaft on either side of the magnet member, means for lenergizing either of the magnetic circuits and thereby moving one of the armatures into contactl with the magnet member near its outer edge and at the same time destroying the magnetism in the other magnetic circuit and releasing the other armature, and a driving-shaft geared directly to one of the armatures and .reversely to the other.

In witness whereof I have hereunto subscribed my name .in the presence of two witnesses.

GEORGE A. DAMON.

Witnesses z BURT S. HARRISON, W. H. ZIMMERMAN., 

